condition mean min max ZT0-3 4.687010000000001 4.577915000000001 4.796105 ZT4-7 4.12887 4.12887 4.12887 ZT8-11 5.54377 5.54377 5.54377 ZT12-15 0 0 0 ZT16-19 6.356785 6.356785 6.356785 ZT20-23 5.09116 5.09116 5.09116